数组中的对象去重

let arr = [{
    from: '张三',
    to: '河南',
}, {
    from: '王二',
    to: '阿里',
}, {
    from: '王二',
    to: '杭州',
}, {
    from: '王二',
    to: '山东',
}, ];
           
unique(arr) {
    const res = new Map();
    return arr.filter(
        (item: {
            from: any
        }) = > !res.has(item.from) && res.set(item.from, 1));
}
           
unique(arr) {
    return arr.reduce(
        (all: any, next: any) = > all.some((atom: any) = > atom.value === next.value) ? all : [...all, next], []);
}

 

参考链接：https://www.cnblogs.com/lilelile/p/11350962.html

参考链接：https://blog.csdn.net/wang1006008051/article/details/86551275